Chroma vs Qdrant

Chroma runs entirely in-process as a Python library, storing embeddings and metadata locally without a database server, cutting RAG prototype setup from hours to 10 minutes.

Chroma's collection API stores text, image, and audio embeddings alongside arbitrary metadata, and filters similarity search results by metadata key-value pairs in a single query.

Chroma's persistent client mode writes embeddings to disk and survives process restarts, making it usable beyond in-memory prototyping without switching to a hosted vector database.

Qdrant's HNSW indexes integrate payload filtering natively, executing filtered nearest-neighbor search without a post-filter scan step, maintaining sub-50ms latency on complex metadata filters.

Qdrant supports sparse vectors natively alongside dense vectors, enabling BM25 and embedding search in the same collection for hybrid retrieval without maintaining two separate indexes.

Qdrant's on-disk HNSW stores vectors on SSD while keeping only graph navigation data in RAM, serving collections larger than server memory at acceptable latency for cost-sensitive deployments.